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ipv6: record the reason for kernel-initiated route deletions

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Record why the kernel deletes an IPv6 route on its own:

- RT_DEL_REASON_EXPIRED for routes reaped by the FIB6 garbage
  collector after their RTF_EXPIRES lifetime ran out.
- RT_DEL_REASON_RA_WITHDRAWN for default routes, prefix routes and
  RFC 4191 route information routes withdrawn by a zero-lifetime
  Router Advertisement.

Deleting a default route because its metric changed is not a
withdrawal, so it keeps RT_DEL_REASON_UNSPEC.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260808005642.26901-4-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Yuyang Huang
2026-08-08 09:56:35 +09:00
committed by Paolo Abeni
parent 352c6732ff
commit e8636445b7
4 changed files with 7 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
net/ipv6/addrconf.c
View File

@@ -2874,7 +2874,8 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
if (rt) {
/* Autoconf prefix route */
if (valid_lft == 0) {
ip6_del_rt(net, rt, false);
ip6_del_rt_reason(net, rt,
RT_DEL_REASON_RA_WITHDRAWN);
rt = NULL;
} else {
table = rt->fib6_table;

2
net/ipv6/ip6_fib.c
View File

@@ -2403,7 +2403,7 @@ static void fib6_gc_table(struct net *net,
hlist_for_each_entry_safe(rt, n, &tb6->tb6_gc_hlist, gc_link)
if (fib6_age(rt, gc_args) == -1)
fib6_del(rt, &info, RT_DEL_REASON_UNSPEC);
fib6_del(rt, &info, RT_DEL_REASON_EXPIRED);
}
static void fib6_gc_all(struct net *net, struct fib6_gc_args *gc_args)

4
net/ipv6/ndisc.c
View File

@@ -1362,7 +1362,9 @@ static enum skb_drop_reason ndisc_router_discovery(struct sk_buff *skb)
defrtr_usr_metric = in6_dev->cnf.ra_defrtr_metric;
/* delete the route if lifetime is 0 or if metric needs change */
if (rt && (lifetime == 0 || rt->fib6_metric != defrtr_usr_metric)) {
ip6_del_rt(net, rt, false);
ip6_del_rt_reason(net, rt,
lifetime == 0 ? RT_DEL_REASON_RA_WITHDRAWN :
RT_DEL_REASON_UNSPEC);
rt = NULL;
}

2
net/ipv6/route.c
View File

@@ -1020,7 +1020,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
gwaddr, dev);
if (rt && !lifetime) {
ip6_del_rt(net, rt, false);
ip6_del_rt_reason(net, rt, RT_DEL_REASON_RA_WITHDRAWN);
rt = NULL;
}